Re: Name this part
The National part number is almost certainly 450574. This seal is for a 2-3/8" shaft size and a 3-1/4" housing. It is 1/2" thick. I don't believe this seal is available anymore however I have National #480574 seals on hand. Same size as the one you pulled out just slightly different construction. I make the timing cover gaskets too. I'm not sure what you were able to get through Amazon, but I regularly stock all engine gaskets for this motor.
Richard
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